PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to shift between number entry and shading modes.)

Theme: Sum of 24 in Both Halves

Author/Opus: This is the 67th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Fill the grid with digits from 1-6 (1-4 in example below) so that each digit appears exactly once in every row and column. When digits touch vertically, the upper digit must always be bigger.

Answer String: Enter the values in each cell in the marked columns from top to bottom, using a capital X for blank cells. The example has the solution “412X3X,324X1X”.

Time Standards (highlight to view): Grandmaster = 4:15, Master = 5:30, Expert = 11:00

Solution: PDF

Note: Follow this link for other less common Number Placement puzzles.

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to shift between number entry and shading modes.)

Theme: Clue Symmetry and Logic

Author/Opus: This is the 66th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Fill the grid with digits from 1-5 (1-4 in example below) so that each digit appears exactly once in every row and column. When digits touch vertically, the upper digit must always be bigger.

Answer String: Enter the values in each cell in the marked rows, using a capital X for blank cells. The example has the solution “412X3X,324X1X”.

Time Standards (highlight to view): Grandmaster = 2:15, Master = 3:00, Expert = 6:00

Solution: PDF

Note: Follow this link for other less common Number Placement puzzles.

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to shift between number entry and shading modes.)

Theme: 1-4 Sequences

Author/Opus: This is the 65th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Fill the grid with digits from 1-4 (also 1-4 in example below) so that each digit appears exactly once in every row and column. When digits touch vertically, the upper digit must always be bigger.

Answer String: Enter the values in each cell in the marked rows, using a capital X for blank cells. The example has the solution “412X3X,324X1X”.

Time Standards (highlight to view): Grandmaster = 1:20, Master = 2:00, Expert = 4:00

Solution: PDF

Note: Follow this link for other less common Number Placement puzzles.

PDF

or solve online (using our beta test of Penpa-Edit tools).

Theme: Near Maximal Difficulty with Near Minimal Givens

Author/Opus: This is the 101st puzzle from our contributing puzzlemaster Grant Fikes.

Rules: Place a number into each cell so that each region contains the numbers 1 to N, where N is the size of the region. A cell with the number M must have at least M cells between it and any other instance of the same number M in that row or column.

Answer String: Enter the numbers in the marked rows in order from left to right, separating the rows with a comma. Start with the 5th row, followed by a comma, followed by the 9th row.

Time Standards (highlight to view): Grandmaster = 5:15, Master = 9:30, Expert = 19:00

Solution: PDF; a solution video is available here.

(view image directly for a larger form)

PDF

or solve online (using our beta test of Penpa-Edit tools)

Theme: 2013 XMas Tree

Rules: Place a digit from 0 to 3 into each area so that no two areas that touch (even diagonally) share the same digit.

Answer String: Enter the row marked A from left to right, followed by a comma, followed by the column marked B from top to bottom.

Time Standards (highlight to view): Grandmaster = 6:00, Master = 10:00, Expert = 20:00

Solution: PDF

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to shift between number entry and shading modes.)

Theme: WPC Practice

Rules: Enter digits 1 through 4 into some cells so that each row and column contains each digit exactly once. Also, along the snail (from the upper-left corner and spiraling to the center) digits must occur in 1-2-3-4-1-2-3-4-… order. Some clues are given in the grid in the form of lit digital segments. Each of these cells must contain a digit, and that digit must have that segment lit in the form shown below the puzzle.

Or see an example from the WPC instructions using 1 to 3 here.

Answer String: Enter the marked rows from left to right, separating the two rows by a comma. Use an X (capital letter) for each empty square.

Time Standards (highlight to view): Grandmaster = 6:00, Master = 8:30, Expert = 17:00

Solution: PDF

PDF

or solve online (using our beta test of Penpa-Edit tools)

Theme: WPC Practice

Rules: Place a digit 1, 2, or 3 into each empty cell so that each digit appears exactly three times in each row and column. All cells are either white or gray. A digit in a white cell must share an edge with at least one cell containing the same digit. A digit in a gray cell cannot share an edge with any cell containing the same digit.

Answer String: Enter the digits from left to right in the marked rows, separating the rows with a comma.

Time Standards (highlight to view): Grandmaster = 10:00, Master = 15:00, Expert = 30:00

Solution: PDF

PDF

or solve online (using our beta test of Penpa-Edit tools)

Theme: Logical

Rules: Place a digit from 1-7 into each circle so that no digit repeats within any straight line. The clues given inside some triangles represent the sum of the digits in the triangle’s three vertices. Or see here.

Answer String: Enter the digits in the marked lines in the direction of the arrows, separating the two lines with a comma.

Time Standards (highlight to view): Grandmaster = 3:45, Master = 4:45, Expert = 9:30

Solution: PDF

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to shift between number entry and shading modes.)

Theme: 22nd WPC in 2013 (the shaded box is just meant to accentuate the theme and has no role in solving). This puzzle type appeared in Round 7 of the WPC from the Serbian constructors under the name “False Doppelblock”

Rules: Fill each row and column of the grid with the numbers 1-6 and two blackened cells. In this false variation, clue numbers outside the grid are either one higher or one lower than the sum of the digits between the two blackened cells in that row/column. True sums can equal zero if the black cells touch. Or see here, but remember this puzzle is a “false” variation with +1/-1 clues unlike that example.

Answer String: Enter the 1st row from left to right, followed by a comma, followed by the 8th row from left to right. Use an X (capital letter) for each blackened square.

Time Standards (highlight to view): Grandmaster = 10:00, Master = 17:30, Expert = 35:00

Solution: PDF

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to shift between number entry and shading modes.)

Theme: Trapped in A box

Rules: Either shade or add a single letter (A, B, or C) to each square so that each row and column contains exactly one A, one B, one C, and the rest shaded squares. Cells in the grid already marked with a letter can be shaded or remain unchanged.

Letters outside the grid indicate the first letter seen from that direction.

Numbers outside the grid describe the size of groups of consecutive shaded squares in that row or column in order. There must be at least one unshaded square between groups.

Or, see here.

Answer String: Enter the number of the column where the B is placed in each row, starting with the top row and proceeding to the bottom.

Time Standards (highlight to view): Grandmaster = 4:30, Master = 5:45, Expert = 11:30

Solution: PDF